Vacuum breakers
Compact, self-closing Vacuum Breakers protect tanks and piping systems against hazards, damage and financial losses caused by vacuum. The VB Vacuum Relief Valve available in PVC and PP feature the same sensitive diaphragm design as the Non-Return Valves allowing them to respond to a minimum of vacuum approximately 2"Hg (6.8kpa).The Plast-O-Matic Series VB and VBM Vacuum Breakers have only one moving part - the patented self-sealing diaphragm, and this provides both design simplicity and maximum operating dependability. This normally-closed design seals in the identical location every time producing a very dependable, long-life seal.
Materials of construction: Series VB is available in PTFE in sizes ¾" and 1". Diaphragms are of EPDM or FKM (Viton). Fasteners used on PTFE Series VB are stainless steel and are NOT in contact with process liquid.
